add sparkjava-mysql application sample

Signed-off-by: Anca Iordache <anca.iordache@docker.com>
master
Anca Iordache 5 years ago
parent 49463cdfdf
commit 2919af7ea3

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FROM maven:3.5-jdk-8-alpine AS build
COPY pom.xml .
RUN mvn --batch-mode dependency:resolve
COPY src/ src
RUN mvn --batch-mode clean compile assembly:single
FROM openjdk:8-jre-alpine3.7
EXPOSE 8080
COPY --from=build target/app.jar /app.jar
CMD java -jar /app.jar

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.company</groupId>
<artifactId>project</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>App</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<finalName>app</finalName>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.sparkjava</groupId>
<artifactId>spark-core</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.4</version>
</dependency>
</dependencies>
</project>

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import com.google.gson.Gson;
import com.mysql.cj.jdbc.exceptions.CommunicationsException;
import static spark.Spark.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
public class App {
public static void main(String[] args) throws Exception {
Class.forName("com.mysql.cj.jdbc.Driver");
prepare();
port(8080);
get("/", (req, res) -> new Gson().toJson(titles()));
}
private static List<String> titles() {
try (Connection conn = connect()) {
List<String> titles = new ArrayList<>();
try (Statement stmt = conn.createStatement()) {
try (ResultSet rs = stmt.executeQuery("SELECT title FROM blog")) {
while (rs.next()) {
titles.add(rs.getString("title"));
}
}
}
return titles;
} catch (Exception ex) {
return new ArrayList<>();
}
}
public static void prepare() throws Exception {
try (Connection conn = connect()) {
recreateTable(conn);
insertData(conn);
}
}
private static void insertData(Connection conn) throws SQLException {
for (int i = 0; i < 5; i++) {
try (PreparedStatement stmt = conn.prepareStatement("INSERT INTO blog (title) VALUES (?);")) {
stmt.setString(1, "Blog post #" + i);
stmt.execute();
}
}
}
private static void recreateTable(Connection conn) throws SQLException {
try (Statement stmt = conn.createStatement()) {
stmt.execute("DROP TABLE IF EXISTS blog");
stmt.execute("CREATE TABLE IF NOT EXISTS blog (id int NOT NULL AUTO_INCREMENT, title varchar(255), PRIMARY KEY (id))");
}
}
private static Connection connect() throws Exception {
for (int i = 0; i < 60; i++) {
try {
return DriverManager.getConnection("jdbc:mysql://db/example?useSSL=false", "root", Files.lines(Paths.get("/run/secrets/db-password")).findFirst().get());
} catch (CommunicationsException ex) {
Thread.sleep(1000L);
continue;
} catch (Exception ex) {
throw ex;
}
}
throw new RuntimeException("Unable to connect to MySQL");
}
}

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version: "3.7"
services:
backend:
build: backend
image: docker.io/docker/back
ports:
- 80:8080
secrets:
- db-password
db:
environment:
MYSQL_DATABASE: example
MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db-password
image: mysql:5.7
restart: always
secrets:
- db-password
volumes:
- db-data:/var/lib/mysql
volumes:
db-data: {}
secrets:
db-password:
file: db/password.txt
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